Dan, I'll assume you're asking about round pushers. Normally, the push pin is unscrewed from the outer round pusher from the inside of the case after the movement is removed. The round pusher on the outside of the case is serated (sp?), fits into a tube that protrudes from the case, and will not rotate. The push pin will normally have a screwdriver slot if it is not too worn. Once the push pin is unscrewed (you will find a spring and o-ring in there, too), the pusher will pull off from the outside. All I have worked on are standard right hand thread.